Radio apparatus



Jan. 15, 1929.

J. H. FLYNN, JR

RADIO APPARATUS Filed May 6, 1926 2 Sheets-Sheet NVENTOR Juv H.T7NN, JR.

A TTORNE Y.

Jan. l5, 1929. 1,699,185

J. H. FLYNN. JR

RADIO APPARATUS NV EN TOR. Jenn H. FLY rmA JR.

, 4, .l TTORNEY.

Patented Jan. 15,

UNITED STATES JOHN H. FLYNN, JR., 0F CINCINNATI, OHIO.

RADIO ArrAnA'rUs.

Application led May 6, 1926. Serial No. 107,201.

The invention relates to radio tuning apparatus. U

The objects of the invention are to provide simple, eflicient, durable,practical, economical and conveniently operative means adapted to tuneor effect resonance in -a radio circuit; and to provide means wherebythe number of manual operative controls may be reduced, in certainphases of the tuning, thereby permitting a greater number of stages ofradio frequency amplification to be included especially, though notexclusively, in a tuned radio frequency radio circuit, withoutimportantly complicating the manual operations required ,to tune thecircuit to the incoming'signals.

The invention consists in the combination of the elements, arrangementof the parts and, further, in the details of the construction, as hereinset forth and claimed.

In the drawings: A

Fig. 1 isa plan view of a pair of variable condensers having theinvention incorporated therein;

Fi l2 is-agsetion taken on spon ing to 2L-2inFig. 1;-

Fig. 3 is a side elevation of/a condenser shaft; 'J f Fig. 4 is adiagrammatical view of a radio ciruit in which t e inventionis'incorporated an Fig. 5- is ay plan lview showing a modied form of thevinvention, with parts broken away .1 l y In-thepreferr'ed constructionof the invention as shown i-n Figs.-1 and 2 I provide front a linecorre- 1 and rear variable condensers 1 and 2 each of port of thecondenser.

which have rear and front sup orts 3 and 4, respectively, maintained infixe spaced apart relation as by bolts 5 received through holes inV thesupports and insulator strips 6. .Threaded 1n hole 7 in front support 4,as shown in Fig. 2, is tube 8 having vnut -9 threaded to its outerprotruding end 10. Tubular shaft 11 extending through tube 8, has itsend 12 vprotruding through the front sup- 1l by usual se arators 21. Therotor plates are maintaine against forward movement on tubular shaft l1by flange 22 integral with the tubular shaft.. Nut or ring 23, 'suitablyfixed to the tubular shaft, bears in close frictlonal contact with rearrotor' plate 24, whereby the rotor plates are maintained in fixedposition.

The stator plates 25, as usual, are arranged 1n fixed relation on bolts26 which are suitably fixed in insulators 6. The stator plates aredisposed in spaced intermediate relation to the respective rotor plates,whereby rotation of tubular shaft 11 moves the rotor plates parallelwith the stator plates, thereby varying the capacity of the condenser.

As shown in Fig. 2, the end 12 of shaft 11, of front condenser l, hasusual manually operative dial 27 suitable fixed thereto by screw 28 forrotating shaft 11. The end 12 of shaft 11,

of rear condenser 2, has end 29 of metal union 30 detachably securedthereto by screw 31.

Extending through union 30 and shafts 1l,

of front and rear condensers l and 2, and slidable therein, is metal rodor shaft 32 having manually operative dial 33 fixed by screw 34 to itsprotruding end 35 whichv exten-ds 'through and forwardly of dial 27. v

`The dials 27 and 33 may be rotated independently of each other therebypermitting independent rotation ofshaft 11 [of frontcon- -denser 1] androd 32. Whenhowcver, it is desirable to rotate rod 32 and shaft v11 ofthe front condenser, the screw'36 in hole 37 in dial 33, maybe screwedtightly. in contact with dial 27, or irrespective of screw 36 the dials27 and 33 may be gripped simultaneously by the o erator to accomplishunison rotation of the ials. Other suitable and conveniently operatedmechanism may be employed to ena le an operator to conveniently rotatethe dials 27 and 33 in unison or independently of each other. For thepurpose of ermitting rotation of the rotor platesl 20 o rear condenser 2through-normal operation of dial 33, the end 30 of the unison 30 isfixed by screw 38 torod 32. By removing screw 3-1 from union 30 the rod32 may be adjustably positioned with respect to Ashaft 11.

In Fig-5., I show a modified form of the invention in which condenser 1is utilized in conjunction with coil 39 consisting of usual primary andsecondary windings 40 and 41 which are wound on tube 42. The primary.

and secondary windings may be connected withthe stator and .rotorplatesof the conoov i densers by usual k'wires 43 and 44, shown broken away. i

The support 45 suitably fixed to tube 42, i'ssecured to shaft 46 by nut46. The shaft 46 fixed to union 30by screw 31 corresponds to shaft 11,of condenser 2 shown in Figs.

1 and 2. The end 30 of union 30 issecured I lby screws 38, to shaft 32,whereby simul- -vtaneous rotation of the dials (not shown) pendently ofone another.

It is apparent that I have invented a high- --ly-desirable device'forthe purposes intended, and by the utilization of which multiple tunedlstages of radio frequency may be incorp'orated in a radio set havingcombined controls that are easily and conveniently operated. In thecircuit 47 shown in Fig. 4, four variable condensers land 2 arecontrollable by two manually operated controls `each of which maycomprise dials 27 and 33 capable of being fixed to each other as shownin Figs.

. 1 and 2 for unison operation. When the circuit 47 is tuned t0 thehighest efliciency of results capable by unison operation of thecondensers, the dials are turned separately whereby the volume of theincoming signals may be increased or reduced at the will of theoperator. The condensers may be substituted by variometers,variocouplersor other variable tuned transformers.

Under certain conditions aswhen the grid return leads are connected to`A 48 and +A 49, it .may be desirable to establish an insulation betweencondensers 1 and2. This resultmay b eefectedby forming union 30 or shaft32 from4 an suitable electricity nonconductive materia such 'as "hardrubber,

paper, glass or the like.

It is further apparent and I desire that it be fully understood that theinventiony may be made of any siz'e and` constructed of anymaterials.deemed convenient, desirable and suitable for a device .of thischaracter, and while I havedescribed and shown in the drawingsparticular forms of the preferred constructions which I have founddesirable in actually reducing the invention to practice, I desire toemphasize the factthat I intend to include in this application all oflthe mechanical equivalents and substitutes that may fairly beconsidered to come with- `in the scope and purview of the invention.

For example, satisfactory results maybe 0btained by means of twovariable condensers p arranged in tandem relation with each other andcontrollable in unison by la single dial, if usual compensatingcondensers, or miniature variable condensers, or compensating plates areutilized incombination with the larger condensers.

What I claim as new and desire to secure by Letters Patent, is: v

1. In a radio tuning apparatus, the combination with a pair ofadjustable condensers, each comprising relatively stationary plates andplates of the opposite polarity movable relative thereto, of anoperating shaft for said movable plates electrically connected therewithfor each of said condensers, a pair of juxtapositioned manuallyoperatiye dials one of which is operatively connected with one of saidshafts, a rod, detachable means for adjustably and operativelylconnecting said 4rod with the other of said shafts and said rod beingoperatively connected with one of said` dials, whereby said' condensersare operated in unison and independently of each other.

2. A radio circuit tuning means, comprising a pair of variablecondensers and each having a. shaft with rotor plates secured thereto, arod, a means for adJustably securing the shaft of one of said condensersto said rod, and a pair of manually operative dials respectively fixedVto the shaft of one condenser and to said rod, whereby independentrotation of said dials effects a chan e in the capacity of saidcondensers indepen ently of each other.

3. A radio tuning apparatus comprising a forward and a rearwardcondenser, each comprising relatively stationary plates and plates ofthe opposite polarity movable relative thereto, an operating shaft foreach condenser for said movable plates electrically connected therwith,.operating mechanism for said shafts and comprising a pairof dialscapable of being 'rotated separately or in unison, one of which is fixedto oneof said shafts, a rod, a tubular union to fix said rod to theother of said tubular shafts, and one of said dials fixed to said rod.

4. In a radio tuning'apparatus, a pair of shaft, a second manuallyoperative meansadjacent said first mentioned manually operative meansand operatively connected withv said rod whereby lsimultaneous operationof said manually operative means is adapted to actuate said tunmg meansin unison, and the independentv operation of said manually operativemeans effects independent actuation of said tuning means. i

. JOHN H. FLYNN, JR.

